SUBSTRUCTURE

Features of substructure: Substructure is classified as box on box type, pieces mounting type, slingshot type, swing up type and telescoping type.

The substructure of box on box type and pieces mounting type, have a relative higher substructure at front platform, satisfies the installation of standard BOP, otherwise, the substructure at back platform is relatively lower, adapts to the installation of heavy equipments such as drawworks and transmission unit etc.

The substructure of slingshot type adapts to electric rig, the drill floor and equipments on it can be installed at low level, and then the drill floor and mast can be raised together. There are hydraulic bumping cylinders on the left and right of the drill floor, in mast rising, they act as bumper, in mast laying down, they act as push power.

The swing up structure, the drill floor and equipments on it can be installed at low level, and the mast can be raised at low location of drill floor, then the whole drill floor. The telescoping structure, mast and substructure are lifted with hydraulic cylinder, the structure stress is reasonable, light-weighted, and convenient to raise and move.

Conforming to API Spec 4F, marked with the official API monogram.